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The original hole cut into the transmission tunnel was larger for automatic cars verses manual cars. When I converted my 71 from auto to manual I used the correct manual boot that you have and made an adapter plate to seal the larger hole for the auto boot. I used the old auto boot as a die to bend the adaptor plate.
Also, the two riveted clips on the left side of the manual boot should clip under the left fiberglass edge of the existing hole to properly position the boot. So your adapter plate is primarily going to be covering the right side of the existing hole.
Wrong Lower Boot ?
